METHOD AND SYSTEM FOR THE INTEGRATED PRODUCTION OF UREA AND MELAMINE
    6.
    发明申请
    METHOD AND SYSTEM FOR THE INTEGRATED PRODUCTION OF UREA AND MELAMINE 审中-公开
    综合生产尿素和梅毒的方法和系统

    公开(公告)号:WO2016171562A1

    公开(公告)日:2016-10-27

    申请号:PCT/NL2016/050291

    申请日:2016-04-25

    Abstract: Disclosed is an integrated process for the production of urea and melamine, as well as a system for carrying out the process. The invention thereby pertains to an integrated process of the type wherein off-gas obtained from the production of melamine is entered into the process for the production of melamine, by condensation in the presence of water. A typical embodiment thereof is the condensation in the presence of an aqueous carbamate solution obtained from urea recovery. In accordance with the invention, said condensation takes place at a substantially lower pressure than the pressure at which the melamine off-gas is obtained. To this end, the pressure of the off-gas is reduced typically by 2-10 bar. In connection herewith, the system of the invention comprises a pressure reducing unit downstream of an outlet for the melamine off-gas, and upstream of a section for the condensation of the off-gas. The invention also includes a method for the modernization of an integrated system for the production of melamine and urea. This is accomplished by adding the aforementioned pressure reducing unit to a pre-existing system.

    Abstract translation: 公开了用于生产尿素和三聚氰胺的综合方法,以及用于进行该方法的系统。 因此,本发明涉及一种其中由三聚氰胺生产得到的废气通过在水存在下的冷凝进入生产三聚氰胺的方法的综合方法。 其典型的实施方案是在由尿素回收获得的氨基甲酸铵水溶液存在下进行缩合。 根据本发明,所述冷凝以比获得三聚氰胺废气的压力低得多的压力进行。 为此,废气的压力通常降低2-10巴。 与此相关的是,本发明的系统包括用于三聚氰胺废气的出口下游的减压单元,以及用于废气冷凝的部分的上游。 本发明还包括一种用于生产三聚氰胺和尿素的综合系统现代化的方法。 这是通过将上述减压单元添加到预先存在的系统来实现的。

    INTEGRATED PRODUCTION OF UREA AND MELAMINE
    9.
    发明申请
    INTEGRATED PRODUCTION OF UREA AND MELAMINE 审中-公开
    综合生产尿素和梅林

    公开(公告)号:WO2015093942A1

    公开(公告)日:2015-06-25

    申请号:PCT/NL2014/050863

    申请日:2014-12-16

    Abstract: Disclosed is a process for the integrated production of urea and melamine. A urea production zone produces a urea synthesis stream comprising urea, water and ammonium carbamate. This stream is subjected to processing, preferably involving stripping, so as to separate an aqueous urea stream from residual dissociated carbamate vapor comprising ammonia, carbon dioxide, and water. The urea is fed to a melamine synthesis zone and subjected to melamine forming conditions so as to form melamine and off-gas comprising carbon dioxide and ammonia. The dissociated carbamate vapor and the melamine off- gas are subjected to combined condensation so as to form a dilute melamine off-gas condensate.

    Abstract translation: 公开了一种尿素和三聚氰胺的综合生产方法。 尿素生产区产生包含尿素,水和氨基甲酸铵的尿素合成流。 对该料流进行处理,优选包括汽提,以便将含水的尿素流与包含氨,二氧化碳和水的残留的解离的氨基甲酸酯蒸气分离。 将尿素进料到三聚氰胺合成区,并进行三聚氰胺形成条件,以形成包含二氧化碳和氨的三聚氰胺和废气。 解离的氨基甲酸盐蒸气和三聚氰胺废气经过联合冷凝,以形成稀的三聚氰胺废气冷凝物。

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